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J. Y. DAHLSTRAND. TURBINE BUCKET BLADE AND METHOD OF MAKING'THE SAME.APPLICATION FILED NOV.- 14. 1917 1 30?,082 Patehted June 1?, 1919.

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-.1' STATES rue JOSEF Y. DAHLSTRAND, 0F WELLSVILLE, YORK, ASSIGNOR TOKERR TURBINE COMPANY, OF WELLSVILLE, NEW YORK, A CORPORATION OF NEWYORK.

remains-BUCKET BLADE sun METHOD or MAKING THE SAME.

To all whom itmag concern: 7

Be it known that I, Josnr Y. DAHLSTRAND, a citizen of Sweden, residingat VVellsvillc, in the county of Allegany and State of New York, haveinvented certain new and useful Improvements in Turbine Bucket Bladesand Methods of Makingthe Same.

This invention relates to new and useful improvements in turbines andmore particularly to the construction of the blades used either inconnection with the rotor-or stator element of a steam turbine.

The objects of this invention are to provide an improved method ofmaking bucket blades whereby the latter may be produced with uniformity,accuracy and at a comparatively low cost.

My invention is illustrated in the accompanying drawings and will behereinafter more fully and clearly described, and particularly pointedout in the appended claims.

Referring to the sheet of drawings in which similar reference charactersindicate the same parts in the several figures;

Figure 1 is a side elevation of an article comprising two turbinebuckets or blades and made according to the invention;

Fig. 2 is a similar view illustrating one method of separating thebuckets;

Fig. 3 is another similar view, illustrating a different method ofseparating the buckets;

Fig. 4. is a longitudinal sectional View on the line IVIV of Fig. 1;

Fig. 5 is a transverse sectional view of a fragment of a turbine wheelor rotor member provided with buckets made according to my invention;

Fig. 6 is a sectional view on the line VI-VI of Fig. 5;

Fig. 7 is a sectional view on the line VIIVII of Fig. 6; and

Fig. 8 a development of a fragment of the shroud ring appearing in Figs.5 and 6.

Referring to Figs. 5 to 8, the numeral 10 indicates the central disk ofa turbine wheel, the buckets being indicated at 11, and the shroud ringat 12. The base of each of the buckets is provided with a tab 13 whichfits a slot in the periphery of the wheel 10 and serves as means forsecuring the bucket to the wheel. In the form of bucket illustrated, thetabs 13 are provided with bulbs 14L, but it will be understood that theinvention is in nowise restricted to this particular detail. In Fig. 7 across-section of the work length of tne bucket shown it and lefthandbuckets.

. Specification of Letters Patent. 1 11129 11361 J me 17, 1919, rapplication fl d November 14,1917. Serial No. 201,966. I

will be noted that the discharge side 15 is and 33, as indicated in Fig.7. To provide 1 for either the clockwise or counter clock-,w1se'd1rect1on of rotat1on,'as seen when looking in the direction offlow of the motive fluid, it is therefore necessary to have right Inconstructing a turbine for clockwise rotation, one type of bucket isused and for counter clockwise rotation, the other type of bucket isused.

The shroud ring 12 may be secured to the ends of the buckets by variousmethods, one of which is shown in Figs. 5 and (3, consists in providingeach bucket with a tenon 17 at the outer end and have these tenons pro ject through suitable perforations 18 in the ring 12. The tenons 17 areriveted over on the outer surface of the ring 12 as indicated at 19. Thering 12 may be formed from a strip of suitable length, the ends of whichmay be welded on a line 20, see Fig. 8. Un equal expansion of thebuckets and shroud ring may be compensated for by means of bends 21 inthe ring, as shown in Fig. 5.

The buckets are, according to my invention, formed in pairs as indicatedin Fig. 1, wherein the bases 18 of the buckets are at the ends of theblank or article from which the buckets are cut. This blank is one solicpiece of metal in which a right hand bucket and a left hand bucket arearranged end to end With their outer ends united. This blank may bedie-formed in a manner that is well understood by those skilled in theart of diemaking.

After the blank has been formed, the next operation is to cut it in two,and the manner of doing this will be determined by the method ofattachment of the buckets or blades to the shroud ring 12. If the encsof the buckets are to be welded to the shroud ring, a plain saw out suchas is indicated at 22, in Fig. 2, will answer. The material removed fromthe blank must, of course, b of such amount as to provide the properlength of buckets. If the buckets are to be at tached to the shroud ringas shown in Figs. 5 and 6, they should be cut as indicated at 23, inFig. 3, either by sawing or by a punchingxoperation.

very material advantage of this method of making buckets is that theblank, as shown in Fig. 1. is suitable for making buckets of differentlength, and the blanks may be nude in large quantities and stored awayfor use as needed. The blanks are of symmetrical form, the ends beingalike, and this is of advantage on account of permitting systematic andcompact storage of the blanks Without liability of injury to the edges.

l/Vh-at I claim is:

1. The herein-described method of making turbine buckets which consistsin forming an oblong blank comprising a right hand bucket and a lefthand bucket having their similar and outer ends integrally united'at thecenter section of the blank, and then cutting the blank in two normalto-its length and through the integral buckets at their united ends.

2. An article consisting of a blank having tWo turbine buckets in endtoend arrangement and with the peripheral ends of the buckets integrallyunited at the center section of the blank.

3. An article consisting of a blank having a right'hand turbine bucketand a left hand turbine bucket in end to end arrangement and with thebases of the buckets at the ends of the blank and the portions of thebucket forming the peripheral ends of said buckets integrally united atthe center section of the blank.

In testimony whereof I aHiX my signature.

JOSEF Y. DAHLSTRAND.

. Copies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents,

Washington, D. 0.

